Hoisting and conveying apparatus.



No. 891,631. V PATENTED JUNE 23, 1908. J. MOMYLER. HOISTING AND CONVEYING APPARATUS.

APPLICATION FILED OUT. 6, 1906.

UNITED s'rA'rn rare JOHN MCMYLER, OF CLEVELAND, OHIO, ASSIGNOR TO THE MGMYLER MANUFACTURING COM- PANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

HOISTING AND CONVEYING- AP?ARATUS.

Specification of Letters Patent.

Patented June 23, 1908.

Application filed October 6, 1906. Serial No. 337,696.

ful Improvement in Hoisting and Conveying Apparatus, of which the following is a full, clear, and exact description.

There is a type of hoisting and conveying apparatus which includes a bridge, a trolley movable thereon and provided with sheaves from which the bucket holding and'closing ropes depend and a clam shell bucket suspended from those ropes. In apparatus of this type, the hoisting and holding ropes, as well as the ropes by which the trolley is moved along the bridge, or some of said ropes, extend in both directions from the trolley to the ends of the bridge. The bridges of this type of apparatus are sometimes quite long. As a result these ropes sag between their sup )orted points, and thereby, for reasons well understood in this art, the satisfactory operation of the apparatus is sensibly impaired. Various forms of sag carriers have been proposed for the purpose of supporting these ropes at points intermediate to the trolley and bridge ends, but such devices, in the forms in which they have heretofore been constructed, have not proved entirely satisfactory; for which rea son, apparently, none of them have gone into extensive use.

The present invention is an improved sag carrier intended particularly for use in an apparatus belonging to the class which has been hereinbefore broadly described.

The sag carrier constituting the present invention consists of two small trolleys located at opposite ends of the main trolley,

I and movable upon the bridge, and carrying sheaves which support the ropes, which would otherwise sag, and connections. be tween the main trolley and the sag carrier trolleys by which the latter are moved in the same direction as the main trolley but at substantially half the speed.

The invention also resides in the means substantially as shown whereby said sag carrier trolleys are moved at the required speed whenever the main trolley is moved.

The invention is shown in the drawing in the best form now known to me, and is hereinafter described. and definitely pointed out in the, claims In the drawing Figure 1 is a side elevation, showing the invention when the main trolley is in its central position. Fig.2 is a similar view showing the invention when the main trolley has been moved about half way from its central position toward one end of the bridge. Fig. 3 is an end view of one of the sag carrier trolleys.

In the drawing A and A represent the tracks which are usually fixed upon a bridge.

B represents the main trolley, which lies for the most part between said tracks and is provided with wheels I), which ride upon the tracks.

0 represents a clam shell bucket, which may be of any suitable construction. D represents the closing ropes, and E the holding ro es for said bucket. These ropes pass to am over sheaves b mounted on trolley B, as shown in dotted lines in the drawing; and then extend in opposite directions toward the ends of the bridge.

F F represent the trolleying ropes which are secured to the trolley and extend in op posite directions therefrom toward the ends of the bridge. It has not. been thought necessary to show the bridge, or the sheaves thereon by which these ropes are supported and guided, nor the means whereby these various ropes are taken in and paid out for the purpose of lowering and opening the bucket, or closingand raising it, or for causing the trolley to move in either direction upon the bridge. A great variety of constructions suitable for these purposes are well known in this art, and any mechanism suitable for the purpose-may be employed.

G-G represent the two sag carrier trolleys, which are respectively located on oppositesides of the main trolley B and are provided with wheels g whichride uponv the tracks A. Each of these sag carrier trolleys includes two or more parallel vertical plates g, which support the rod 9 on which are mounted as many sheaves g as are required to support the various ropes. A rope K is attached at its end to the remote ends of the two trolleys G. This rope, from its points of attachment with the two trolleys, extends in opposite directions to the ends of the bridge and then oversuitable sheaves as M-M N-N. Two other ropes J J are provided, each of which is dead ended at one end as 3i and 35, and extends from this fixed end hast the center of the bridge, then over a sheave g on one ofthe trolleys G and thence back to the main trolley B to which it is fixedly connected.

' 'It is evident that as the main trolley B is moved, toward one end or the other of the bridge, it drags along with it that one of the trolleys g which is then on behind it but be' cause of the manner of the reeving of ropes J and J, the movement of said trolley G will onl behalf asfa'st as the movement of the tro ley B. The movement of one of the trolleys G will, through the ropeK, move the other trolley an equal distance in the same direction. Each of the trolleys G is preferably placed midway between the end of the bridge and the main trolley B. Since each of these trolleys moves in thedirection the-combination of a movable tro sheaves g, which sheaves Wl are located at'opposlte en s o the main trolley and are provided with deviceswhich su 'port said ropes, and means for positivey moving the two sag-carrying trolleys simul taneously with the maintrolley and m the same direction but at less speed.

2. In hoisting and. eonveyin apparatus, the combination of'a main trol ey, two sagearrying trolleys located'at opposite ends of said mam trolley, two ropes, each of which is associated with one of the sag-carrying trolleys and is connected with the mam trolley and extends therefrom over a sheave on the associated sag-carrying trolley and thence vback to a fixture'to which it is secured, and means which positively connect the two sag- .carrying trolleys and om e1 them to move simultaneously rection.

3. In hoisting and conveying apparatus,

the combination of a main trolley and ropes which extend in opposite directions from said and quick y in the same di-' trolley, with two sag-carrying trolleys located at opposite en s of the main trolley, sheaves mounted upon each of the sag-carrying trolleys over which said ropes extend and by which they are supported, another sheave mounted in each of said sag-carrying trolleys, two ropes each of which is fixed at one end and extends therefrom over one of the last mentioned sheaves on the associated sag-carrying trolleys and thence back to the main trolley to which it is secured, and another rope which is secured at one end to one of the sa'g-carryin trolleys and extends therefrom away from t e main trolley over a suitable sheave andthence back past the three .trolleys and over another sheave and thence back to the other sagcarrying trolley to which it is made fast.

4. In hoisting and conveying ap aratus,

the combination of a movable trol ey with ropes which extend therefrom inopp'o si'te directions, With'sag-carrying trolleys which are located at opposite ends of the main trolley, and are provided with devices which support said ropes and means positively connecting the sa' -carrying trolleys with the main trolley, a apted positively to regulate the speed carrying trolleys to the same direction and to a lower rate than the main trolley and to simultaneous movement therewith, "said connections being independent friction.

5'. In hoisting and conveying 'ap aratus,

the combination of a movable tro ey and ropes which extend therefrom in opposite d1- motions, with sag-carrying trolleyswhich are located at opposite ends of themain trolley, and are provided with devices which support said ropes, and cables positively connecting the sag-carrying trolleys with the main trolley and positively connecting the sagcarrying trolleyswith each other so, as to efiect simultaneous movement of the sa carrying trolleys and the main trolley an to cause the sag-carrying trolleys to move in the same direction with the main trolley but at less speed.

In testimony'whereof, I hereunto affix my signature in the presence of two witnesses.

JOHN McMYLER.

Witnesses:

E. B. GILCHRIST. E. L. TnURsToN. 

